Improvement in modes of attaching fhe heads of bolts, rivets, and nails



G. B, BRAYTON. MODE 0? ATTAGHING THE HEADS 0F BOLTS, RIVETS, AND NAILS.

No. 38,652. Patented May 26, 1863.

I Fly. 3.

Ira/6215071 UNITED STATES- PATENT OFFI E.

GEORGE B. BR'AYTON, 0F PROVIDENCE, RHODE ISLAND.

IMPROVEMENT m MODES orv AQTTACHING THE HEADS or Bo'LTs, RlVET S, Ann N-AILS.

Specification forming part of Letters Patent No. 38,662, dated May 26, 1863 antedated April 18, 1863.

To all whom it may concern 4 Be it known that I, GEORGE B. BRAYTON, of thecit-y and county of Providence, and State of .Rhode Island, have invented a new and useful method and improvement in the inanefacture of bolts, screws, spikes, and rivets, of

which the following is a fu l and exact d'escription, reference being had to the drawings and model annexed.

I first prepare a piece of metal of a proper size and thickness for a head, usually in a punchihg-press, and having heated it'sufficiently, I place it in a machine with proper devices for performing all the necessary opera-a head and both pieces into a heading-die thereby giving the head the desired form and finishing the rivet or bolt, &c., Fig. 2. In this operation the result occurs which constitutes the method of 'dovetailing together two pieces of metal, for when thec'nd of shank is. forced into the heated head-it becomes softened, and when it is forced still farther into the head-the resistance itmeets in the" heading-die causes the end of the shank to ex-[ pand in the head, while the shank-die fitting shank so closely prevents the neck ofit expanding, thus forming a perfect dovetail joint, the shrinking of v the metal as it cools adding strength and solidity thereto, Fig. 3. Having thus'describedmyinveution, Iwish it to be distinctly understood that-1 claim- The method of dovetailing together two pieces of metal to form abolt, screw, spike,

or rivet by forcing the shank into and expanding the end of the same within the head, substantially as herein described.

In witness whereof I hereunto subscribe my name the 1st day of-October, 1860.

GEO. B; BRAYTON. [L. s.]

in presence of- JAMES S. DAVIS, Jr.. L. M.'WARE. 

